More percent review

Front

What is simple interest?

Back

Simple interest is calculated using the formula: I = PRT, where I is the interest, P is the principal amount, R is the rate of interest per year, and T is the time in years.

Front

How do you calculate the final price after a discount?

Back

To calculate the final price after a discount, subtract the discount amount from the original price. Discount amount = Original Price x Discount Rate.

Front

What is the formula for calculating the interest earned on an investment?

Back

The formula for calculating interest earned is I = PRT, where I is the interest, P is the principal amount, R is the annual interest rate (as a decimal), and T is the time in years.

Front

How do you calculate the total cost including tax?

Back

To calculate the total cost including tax, multiply the price by the tax rate and add it to the original price. Total Cost = Price + (Price x Tax Rate).

Front

What is a percentage?

Back

A percentage is a fraction expressed as a part of 100. It is used to compare relative sizes and express how much of one quantity exists in relation to another.

Front

How do you find the rate of interest from simple interest?

Back

To find the rate of interest, rearrange the simple interest formula: R = I / (PT).

Front

What does '25% off' mean?

Back

'25% off' means that the price is reduced by 25% of the original price. For example, if an item costs $100, a 25% discount means you pay $75.

Front

If an item costs $500 and is on sale for 15% off, what is the discount amount?

Back

The discount amount is $500 x 0.15 = $75.

Front

What is the total interest earned on an investment of $2,500 at 5% for 9 years?

Back

Total interest earned = PRT = $2,500 x 0.05 x 9 = $1,125.

Front

How do you calculate the sale price after applying a discount and tax?

Back

First, calculate the sale price after discount, then calculate the tax on that sale price, and finally add the tax to the sale price.